Heck, digital currencies and investing in pot penny stocks were hard to imagine just five years ago.

But now investing in Bitcoin pot penny stocks is a reality.

It's become possible because now you can buy marijuana legally in many states, and Bitcoin has risen from an obscure experiment to a promising new form of money.

And a few tiny, enterprising companies have combined the two by coming up with ways to allow people to buy marijuana with Bitcoin.

So it is now possible to invest in Bitcoin pot penny stocks – penny stocks that tap into both of these hot 21st century trends.

Let's take a look at why each of these trends presents powerful investing opportunities, particularly when combined.

First, there's the acceleration toward the legalization of marijuana, which has driven several pot penny stocks much higher this year. For example, GreenGro Technologies Inc. (OTCMKTS: GRNH) is up 547% year to date, and Hemp Inc. (OTCMKTS: HEMP) is up 190%.

Today you can legally buy cannabis in both Colorado and Washington. The number of states that allow medical marijuana has already reached 18, with eight more considering it.

"The demand for marijuana is insatiable," said Perlowin. "You have a feeding frenzy for the birth of a new industry."

And there's Bitcoin.

As the Bitcoin price rocketed last year from less than $14 to more than $1,100, the business community took note.

As Bitcoin use grows, more and more companies are springing up to exploit the unique capabilities of the digital currency, and that means we're seeing more Bitcoin penny stocks coming to market.

Most Bitcoin businesses at this point are startups in which only venture capitalists can invest, but a few are penny stocks.

Tapping into both the growing market for marijuana and the potential of Bitcoin is an intriguing investing prospect, to say the least. Here are three Bitcoin pot penny stocks that seek to profit from this magic formula…

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